© 2018 Titin Andri Wihastuti, Teuku Heriansyah, Hanifa Hanifa, Sri Andarini, Zuhrotus Sholichah, Yuni Hendrati Sulfia, Aditya Angela Adam, Jeki Refialdinata, Nurul Cholifah Lutfiana, published by Slovak Academy of Sciences, Mathematical Institute
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